Cassandra (So Vile a Sin)

Cassandra

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It appeared to be a comet, but was in reality a TARDIS damaged during the war with the Great Vampires. After the crew was killed and it had not been used for ten thousand years, it shut down power. Drifting near Agamemnon, if fell into an erratic orbit for the next ten million years. It sent out a distress signal, which activated any dormant N-Forms which the signal crossed.